Floor cleaning apparatus with pre-filter

• US 5,608,947 A
• Filed: 05/31/1995
• Issued: 03/11/1997
• Est. Priority Date: 04/25/1994
• Status: Expired due to Term

• Current Assignee: Karcher North America Incorporated (Alfred Kärcher SE & Co. KG)
• Original Assignee: Windsor Industries Incorporated (Alfred Kärcher SE & Co. KG)
• Inventors: Strickland, Timothy A., O'Hara, Robert J., Knowlton, Christopher M.
• Primary Examiner(s): Scherbel, David
• Assistant Examiner(s): ALEXANDER, REGINALD
• Application Number:
  US08/455,076
• Time in Patent Office: 650 Days
• Field of Search: 15/347, 15/349, 15/340.4, 15/340.3, 15/320, 15/401, 55/337, 55/456, 55/498, 55/527
• US Class Current: 15/340.4
• CPC Class Codes: A47L 11/24 Floor-sweeping machines, motor-driven
• CPC Class Codes: A47L 11/29 Floor-scrubbing machines characterised by means for taking-up dirty liquid
• CPC Class Codes: A47L 11/293 the tools being disc brushes
• CPC Class Codes: A47L 11/30 by suction
• CPC Class Codes: A47L 11/302 having rotary tools
• CPC Class Codes: A47L 11/4044 Vacuuming or pick-up tools; Squeegees
• CPC Class Codes: A47L 11/4061 Steering means; Means for avoiding obstacles; Details related to the place where the driver is accommodated

Abstract

The present invention provides an apparatus for cleaning floors. In one embodiment, the apparatus includes four wheels, two of which are steerable wheels, and a steering mechanism that permits the two steerable wheels to turn to a degree that allows very tight turns to be made by the sweeper. In another embodiment, the apparatus is a sweeper with a cylindrical side broom. Yet a further embodiment of the sweeper includes flaps or seals that form a skirt about the broom and a mounting mechanism for slidably receiving the flap or seal. In a further embodiment, the apparatus is a sweeper that employs flaps with wear indicators that tell an operator when to adjust or replace the flap. In another embodiment, the apparatus is a sweeper that utilizes a pre-filter to remove debris that remains in the vacuum airstream after having passed through the hopper and that is of a size that can require frequent cleaning of a subsequent filtering device. In yet a further embodiment, the apparatus is a scrubber with two counter rotating disk brushes, a primary squeegee, and a second or pre-squeegee for relieving the primary squeegee from processing the heavier concentration of wastewater produced in the area between the brushes. In yet another embodiment, the apparatus is a scrubber that includes a squeegee mounting systems that is relatively easy to use and permits the squeegee rubber to extend beyond the end of the mounting structure.

Claims

1. An apparatus for cleaning a surface comprising:

a frame;

means, operatively attached to said frame, for cleaning surface;

at least three wheels for moving said frame and said means for cleaning over a surface; and

means for steering at least one of said at least three wheels;

said means for cleaning includes a hopper for receiving a debris laden airstream, precipitating first heavier debris from said debris laden airstream, collecting said first heavier debris, and providing a first exit airstream that may contain lighter debris;

a pre-filter for receiving said first exit airstream, precipitating out second heavier debris that is generally lighter than said first heavier debris from said first exit airstream, collecting said second heavier debris, and providing a second exit airstream that may contain lighter debris; and

a filter for receiving said second exit airstream, precipitating out third heavier debris that is generally lighter than said first and second heavier debris from said airstream, collecting third heavier debris and providing a third exit airstream that is substantially free of debris;

wherein said pre-filter includes means for moving into contact with at least a portion of said second heavier debris in said first exit airstream.

2. An apparatus, as claimed in claim 1, wherein:

said means for cleaning includes a rotating broom.

6. An apparatus, as claimed in claim 1, wherein:

said filter includes a pleated panel filter.

18. An apparatus, as claimed in claim 1, wherein:

said means for movingly contacting includes a vaned wheel.

19. An apparatus, as claimed in claim 1, wherein:

said means for movingly contacting includes a wheel with a cup, wherein upon rotation of said wheel, said cup directs said second heavier debris to a means for collection.

20. An apparatus, as claimed in claim 1, wherein:

said hopper includes a first portion for collecting said first heavier debris and a second portion for collecting said second heavier debris that is separate from said first portion.

21. An apparatus, as claimed in claim 1, wherein:

said means for cleaning includes at least one of the following;

(a) a first broom that is substantially located within a first area bounded by an exterior body of the apparatus;

a second broom that, when in use, rotates about an axis that is substantially parallel to said surface and that is located in a second area that is outside of said first area;

(b) a flap;

means for mounting said flap to said frame;

wherein said flap includes an upper edge having a first thickness and a lower edge having a second thickness that is less than said first thickness;

wherein said means for mounting includes a first longitudinal extending slot for holding said flap, said slot having an upper portion for holding said upper edge of said flap and a lower portion for holding at least a portion of said lower edge but incapable of accommodating said upper edge of said flap;

wherein said flap can be slidably inserted into and slidably removed from said slot;

(c) includes a flexible, substantially planar member that includes a first terminal edge and a second terminal edge, wherein when said flexible, substantially planar member is in use, said first terminal edge contacts said surface and said second terminal edge is operatively connected to said frame and separated from said surface;

wherein said flexible, substantially member includes a wear indicator located between said first and second terminal edges and, prior to any wear of said first terminal edge, separated from said first terminal edge.

22. An apparatus, as claimed in claim 19, wherein:

said means for movingly contacting includes a vaned wheel.

3. An apparatus for cleaning a surface, comprising:

a frame;

means, operatively attached to said frame, for cleaning a surface;

at least three wheels for moving said frame and said means for cleaning over a surface; and

means for steering at least one of said at least three wheels;

said means for cleaning includes a hopper for receiving a debris laden airstream, precipitating first heavier debris from said debris laden airstream, collecting said first heavier debris, and providing a first exit airstream that may contain lighter debris;

a pre-filter for receiving said first exit airstream, precipitating out second heavier debris that is generally lighter than said first heavier debris from said first exit airstream, collecting said second heavier debris, and providing a second exit airstream that may contain lighter debris; and

a filter for receiving said second exit airstream, precipitating out third heavier debris that is generally lighter than said first and second heavier debris from said airstream, collecting third heavier debris and providing a third exit airstream that is substantially free of debris;

wherein said pre-filter includes vanes for creating a vortex;

wherein said pre-filter includes means that moves in response to said first exit airstream.

4. An apparatus for cleaning a surface, comprising:

a frame;

means, operatively attached to said frame, for cleaning a surface;

at least three wheels for moving said frame and said means for cleaning over a surface; and

means for steering at least one of said at least three wheels;

said means for cleaning includes a hopper for receiving a debris laden airstream, precipitating first heavier debris from said debris laden airstream, collecting said first heavier debris, and providing a first exit airstream that may contain lighter debris;

a pre-filter for receiving said first exit airstream, precipitating out second heavier debris that is generally lighter than said first heavier debris from said first exit airstream, collecting said second heavier debris, and providing a second exit airstream that may contain lighter debris; and

a filter for receiving said second exit airstream, precipitating out third heavier debris that is generally lighter than said first and second heavier debris from said airstream, collecting third heavier debris and providing a third exit airstream that is substantially free of debris;

wherein said pre-filter includes vanes for creating a vortex;

wherein said pre-filter includes a vaned wheel.

5. An apparatus for cleaning a surface, comprising:

a frame;

means, operatively attached to said frame, for cleaning a surface;

at least three wheels for moving said frame and said means for cleaning over a surface; and

means for steering at least one of said at least three wheels;

said means for cleaning includes a hopper for receiving a debris laden airstream, precipitating first heavier debris from said debris laden airstream, collecting said first heavier debris, and providing a first exit airstream that may contain lighter debris;

a pre-filter for receiving said first exit airstream, precipitating out second heavier debris that is generally lighter than said first heavier debris from said first exit airstream, collecting said second heavier debris, and providing a second exit airstream that may contain lighter debris; and

a filter for receiving said second exit airstream, precipitating out third heavier debris that is generally lighter than said first and second heavier debris from said airstream, collecting third heavier debris and providing a third exit airstream that is substantially free of debris;

wherein said pre-filter includes vanes for creating a vortex;

wherein said pre-filter includes a wheel with a cup, wherein upon rotation of said wheel, said cup directs said second heavier debris to a means for collection.

7. An apparatus for cleaning a surface, comprising:

a frame;

means, operatively attached to said frame, for cleaning a surface;

at least three wheels for moving said frame and said means for cleaning over a surface; and

means for steering at least one of said at least three wheels;

said means for cleaning includes a hopper for receiving a debris laden airstream, precipitating first heavier debris from said debris laden airstream, collecting said first heavier debris, and providing a first exit airstream that may contain lighter debris;

a pre-filter for receiving said first exit airstream, precipitating out second heavier debris that is generally lighter than said first heavier debris from said first exit airstream, collecting said second heavier debris, and providing a second exit airstream that may contain lighter debris; and

a filter for receiving said second exit airstream, precipitating out third heavier debris that is generally lighter than said first and second heavier debris from said airstream, collecting third heavier debris and providing a third exit airstream that is substantially free of debris;

wherein said pre-filter includes vanes for creating a vortex;

wherein said hopper includes a first portion for collecting said first heavier debris and a second portion for collecting said second heavier debris that is separate from said first portion.

8. An apparatus for cleaning a surface, comprising:

a frame;

means, operatively attached to said frame, for cleaning a surface;

at least three wheels for moving said frame and said means for cleaning over a surface; and

means for steering at least one of said at least three wheels;

said means for cleaning includes a hopper for receiving a debris laden airstream, precipitating first heavier debris from said debris laden airstream, collecting said first heavier debris, and providing a first exit airstream that may contain lighter debris;

a pre-filter for receiving said first exit airstream, precipitating out second heavier debris that is generally lighter than said first heavier debris from said first exit airstream, collecting said second heavier debris, and providing a second exit airstream that may contain lighter debris; and

a filter for receiving said second exit airstream, precipitating out third heavier debris that is generally lighter than said first and second heavier debris from said airstream, collecting third heavier debris and providing a third exit airstream that is substantially free of debris;

wherein said pre-filter includes vanes for creating a vortex;

wherein said means for cleaning includes at least one of the following;

(a) a first broom that is substantially located within a first area bounded by an exterior body of the apparatus;

a second broom that, when in use, rotates about an axis that is substantially parallel to said surface and that is located in a second area that is outside of said first area;

(b) a flap;

means for mounting said flap to said frame;

wherein said flap includes an upper edge having a first thickness and a lower edge having a second thickness that is less than said first thickness;

wherein said means for mounting includes a first longitudinal extending slot for holding said flap, said slot having an upper portion for holding said upper edge of said flap and a lower portion for holding at least a portion of said lower edge but incapable of accommodating said upper edge of said flap;

wherein said flap can be slidably inserted into and slidably removed from said slot;

(c) includes a flexible, substantially planar member that includes a first terminal edge and a second terminal edge, wherein when said flexible, substantially planar member is in use, said first terminal edge contacts said surface and said second terminal edge is operatively connected to said frame and separated from said surface;

wherein said flexible, substantially member includes a wear indicator located between said first and second terminal edges and, prior to any wear of said first terminal edge, separated from said first terminal edge.

9. An apparatus for cleaning a surface comprising:

a frame;

means, operatively attached to said frame, for cleaning a surface;

at least three wheels for moving said frame and said means for cleaning over a surface; and

means for steering at least one of said at least three wheels;

wherein said means for cleaning includes a rotating broom means for lifting debris off the surface and thereby aiding in establishing a debris laden air stream;

a hopper for receiving said debris laden airstream, precipitating first heavier debris from said debris laden airstream, collecting said first heavier debris, and providing a first exit airstream that may contain lighter debris;

a pre-filter for receiving said first exit airstream, precipitating out second heavier debris that is generally lighter than said first heavier debris from said first exit airstream, collecting said second heavier debris, and providing a second exit airstream that may contain lighter debris; and

a filter for receiving said second exit airstream, precipitating out third heavier debris that is generally lighter than said first and second heavier debris from said airstream, collecting third heavier debris and providing a third exit airstream that is substantially free of debris;

wherein said pre-filter includes means for moving into contact with at least a portion of said second heavier debris in said first exit airstream.

10. An apparatus, as claimed in claim 9, wherein:

said rotating broom means includes a first rotating broom that rotates, when in operation, about an axis that is substantially parallel to the surface.

11. An apparatus, as claimed in claim 10, wherein:

said first rotating broom is located substantially within a first area bounded by an exterior body of the apparatus.

12. An apparatus, as claimed in claim 11, wherein:

said rotating broom means includes a second rotating broom that is located in a second area that is outside of said first area.

13. An apparatus, as claimed in claim 12, wherein:

said second rotating broom rotates, when in operation, about an axis that is substantially parallel to the surface.

14. An apparatus, as claimed in claim 9, wherein:

said rotating broom means includes a first rotating broom for sweeping debris, when in operation, from an area substantially outside of an exterior surface of the apparatus.

15. An apparatus, as claimed in claim 14, wherein:

said rotating broom means includes means for selectively positioning said first rotating broom between an operative position adjacent the surface and an inoperative position away from the surface.

16. An apparatus, as claimed in claim 14, wherein:

said rotating broom means includes means for selectively positioning said first rotating in said area substantially outside of said exterior surface of the apparatus.

23. An apparatus, as claimed in claim 9, wherein:

said means for movingly contacting includes a wheel with a cup, wherein upon rotation of said wheel, said cup directs said second heavier debris in said second direction.

24. An apparatus, as claimed in claim 9, wherein:

said hopper includes a first portion for collecting said first heavier debris and a second portion for collecting said second heavier debris that is separate from said first portion.

25. An apparatus, as claimed in claim 9, wherein:

said means for cleaning includes at least one of the following;

(a) a first broom that is substantially located within a first area bounded by an exterior body of the apparatus;

a second broom that, when in use, rotates about an axis that is substantially parallel to said surface and that is located in a second area that is outside of said first area;

(b) a flap;

means for mounting said flap to said frame;

wherein said flap includes an upper edge having a first thickness and a lower edge having a second thickness that is less than said first thickness;

wherein said means for mounting includes a first longitudinal extending slot for holding said flap, said slot having an upper portion for holding said upper edge of said flap and a lower portion for holding at least a portion of said lower edge but incapable of accommodating said upper edge of said flap;

wherein said flap can be slidably inserted into and slidably removed from said slot;

(c) includes a flexible, substantially planar member that includes a first terminal edge and a second terminal edge, wherein when said flexible, substantially planar member is in use, said first terminal edge contacts said surface and said second terminal edge is operatively connected to said frame and separated from said surface;

wherein said flexible, substantially member includes a wear indicator located between said first and second terminal edges and, prior to any wear of said first terminal edge, separated from said first terminal edge.

17. An apparatus for cleaning a surface, comprising:

a frame;

means, operatively attached to said frame, for cleaning a surface;

at least three wheels for moving said frame and said means for cleaning over a surface; and

means for steering at least one of said at least three wheels;

wherein said means for cleaning includes a rotating broom means for lifting debris off the surface and thereby aiding in establishing a debris laden air stream;

a hopper for receiving said debris laden airstream, precipitating first heavier debris from said debris laden airstream, collecting said first heavier debris, and providing a first exit airstream that may contain lighter debris;

a pre-filter for receiving said first exit airstream, precipitating out second heavier debris that is generally lighter than said first heavier debris from said first exit airstream, collecting said second heavier debris, and providing a second exit airstream that may contain lighter debris; and

a filter for receiving said second exit airstream, precipitating out third heavier debris that is generally lighter than said first and second heavier debris from said airstream, collecting third heavier debris and providing a third exit airstream that is substantially free of debris;

wherein said pre-filter includes vanes for creating a vortex;

said rotating broom means includes a first rotating broom for sweeping debris, when in operation, from an area substantially outside of an exterior surface of the apparatus;

said first rotating broom, when in operation, rotates about an axis that is substantially parallel to the surface; and

said rotating broom means includes means for permitting said first rotating broom, when in operation, to rotate about an axis that is substantially perpendicular to the surface.